<template>
    <div>
        <!-- 面包屑导航区域 -->
        <el-breadcrumb separator-class="el-icon-arrow-right">
            <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
            <el-breadcrumb-item>商品管理</el-breadcrumb-item>
            <el-breadcrumb-item>参数列表</el-breadcrumb-item>
        </el-breadcrumb>

        <!-- 卡片视图区域 -->
        <el-card>
            <!-- 警告区域 -->
            <el-alert
                title="注意：只允许为第三级分类设置相关参数！"
                type="warning"
                :closable='false'
                show-icon>
            </el-alert>

            <!-- 选择商品分类区域 -->
            <el-row class="cat_opt">
                <el-col>
                    <span>选择商品分类：</span>
                    <!-- 选择商品分类的级联选择框 -->
                    <el-cascader
                    v-model="selectedCateKeys"
                    :props="cateProps"
                    :options="cateList"
                    @change="handleChange"
                    expand-trigger="hover"></el-cascader>
                </el-col>
            </el-row>

            <!-- tab页标签区域 -->
            <el-tabs v-model="activeName" 
            @tab-click="handleTabClick">
                <!-- 添加动态参数面板 -->
                <el-tab-pane label="动态参数" name="many">
                    <el-button type="primary" size="mini" 
                    :disabled='isButnDisabled'
                    @click="addDialogVisible = true">添加参数</el-button>
                    <!-- 动态参数表格 -->
                    <el-table :data='manyTableData' border stripe>
                        <!-- 展开行 -->
                        <el-table-column type='expand'>
                            <template slot-scope="scope">
                                <!-- 循坏渲染Tag标签 -->
                                <el-tag v-for="(item,i) in scope.row.attr_vals" 
                                :key="i" closable @close='handleClose(i)'>{{item}}
                                </el-tag>
                                <!-- 输入的文本框 -->
                                <el-input
                                class="input-new-tag"
                                v-if="scope.row.inputVisible"
                                v-model="scope.row.inputValue"
                                ref="saveTagInput"
                                size="small"
                                @keyup.enter.native="handleInputConfirm(scope.row)"
                                @blur="handleInputConfirm(scope.row)">
                                </el-input>
                                <!-- 添加按钮 -->
                                <el-button v-else 
                                class="button-new-tag" 
                                size="small" 
                                @click="showInput(scope.row)"
                                >+ New Tag</el-button>

                            </template>
                        </el-table-column>
                        <!-- 索引列 -->
                        <el-table-column type='index'></el-table-column>
                        <el-table-column label='参数名称' prop='attr_name'></el-table-column>
                        <el-table-column label='操作'>
                            <template slot-scope="scope">
                                <el-button type="primary" icon="el-icon-edit" 
                                size="mini" @click="showEditDialog(scope.row.attr_id)">
                                    </el-button>
                                    <el-button type="danger" icon="el-icon-delete" 
                                    size="mini" @click="removeParams(scope.row.attr_id)">
                                    </el-button>
                            </template>
                        </el-table-column>
                    </el-table>
                </el-tab-pane>
                <!-- 添加静态属性的面板 -->
                <el-tab-pane label="静态属性" name="only">
                    <el-button type="primary" size="mini"
                    :disabled="isButnDisabled" 
                    @click="addDialogVisible = true">添加属性</el-button>

                    <!-- 静态属性表格 -->
                    <el-table :data='onlyTableData' border stripe>
                        <!-- 展开行 -->
                      <el-table-column type='expand'>
                            <template slot-scope="scope">
                                <!-- 循坏渲染Tag标签 -->
                                <el-tag v-for="(item,i) in scope.row.attr_vals" 
                                :key="i" closable @close='handleClose(i)'>{{item}}
                                </el-tag>
                                <!-- 输入的文本框 -->
                                <el-input
                                class="input-new-tag"
                                v-if="scope.row.inputVisible"
                                v-model="scope.row.inputValue"
                                ref="saveTagInput"
                                size="small"
                                @keyup.enter.native="handleInputConfirm(scope.row)"
                                @blur="handleInputConfirm(scope.row)">
                                </el-input>
                                <!-- 添加按钮 -->
                                <el-button v-else 
                                class="button-new-tag" 
                                size="small" 
                                @click="showInput(scope.row)"
                                >+ New Tag</el-button>

                            </template>
                        </el-table-column>
                        <!-- 索引列 -->
                        <el-table-column type='index'></el-table-column>
                        <el-table-column label='属性名称' prop='attr_name'></el-table-column>
                        <el-table-column label='操作'>
                            <template slot-scope="scope">
                                <el-button type="primary" 
                                icon="el-icon-edit" 
                                size="mini"
                                @click="showEditDialog(scope.row.attr_id)">
                                    编辑</el-button>
                                    <el-button type="danger" icon="el-icon-delete" 
                                    size="mini" @click="removeParams(scope.row.attr_id)">
                                    删除</el-button>
                            </template>
                        </el-table-column>
                    </el-table>
                </el-tab-pane>
            </el-tabs>    
            
        </el-card>
        <!-- 添加参数的对话框 -->
        <el-dialog
        :title='"添加" + titleText'
        :visible.sync="addDialogVisible"
        width="50%"
        @close='addDialogClosed'>
        <el-form :model="addForm" 
        :rules="addFormRules" 
        ref="ruleFormRef" 
        label-width="100px">
            <el-form-item :label="titleText" prop="attr_name">
                <el-input v-model="addForm.attr_name"></el-input>
            </el-form-item>
        </el-form>
        <span slot="footer" class="dialog-footer">
            <el-button @click="dialogVisible = false">取 消</el-button>
            <el-button type="primary" @click="addParams">确 定</el-button>
        </span>
        </el-dialog>

    <!-- 修改参数对话框 -->
        <el-dialog
        :title="'修改'+ titleText"
        :visible.sync="editDialogVisible"
        width="50%"
        @close='editDialogClosed'>
        <el-form v-model="editForm" 
        :rules="editFormRules" 
        ref="ruleFormRef" 
        label-width="100px">
            <el-form-item :label="titleText" prop="attr_name">
                <el-input v-model="editForm.attr_name"></el-input>
            </el-form-item>
        </el-form>
        <span slot="footer" class="dialog-footer">
            <el-button @click="dialogVisible = false">取 消</el-button>
            <el-button type="primary" @click="editParams">确 定</el-button>
        </span>
        </el-dialog>


    </div>
</template>
<script>
export default{
    data(){
        return{
            // 商品分类列表
            cateList: [],
            // 级联选择框配置对象
            cateProps:{
                value: 'cat_id',
                label: 'cat_name',
                children: 'children'
            },
            // 级联选择框双向绑定到的数组
            selectedCateKeys:[],
            // 被激活的页签的名称
            activeName: 'many',
            // 动态参数的数据
            manyTableData:[],
            // 静态属性的数据
            onlyTableData:[],
            // 控制添加对话框的显示何隐藏
            addDialogVisible: false,
            // 添加参数的表单数据对象
            addForm:{
                attr_name: ''
            },
            // 添加表单的验证数据规则对象
            addFormRules:{
                attr_name: [
            { required: true, message: '请输入参数', trigger: 'change' }
                ]
            },
          // 控制修改对话框的显示和隐藏
            editDialogVisible:false,
             // 修改参数的表单数据对象
            editForm:{},
             // 修改表单的验证数据规则对象
            editFormRules:{
                attr_name: [
                    { required: true, message: '请输入参数', trigger: 'change' }
                    ]
                },
        }
    },
    created(){
        this.getCateList()
    },
    methods:{
        // 获取所有的商品分类列表
        async getCateList(){
            const {data:res} = await this.$http.get('categories')
            if(res.meta.status !== 200){
                return this.$message.error('获取商品分类失败！')
           
            }
            this.cateList = res.data  
            console.log(this.catelist); 
        },
        // 级联选择框选中变化，会触发这个函数
        handleChange(){
            this.getParamsData()
        },
        // tab 页签点击事件处理函数
        handleTabClick(){
            this.getParamsData()
            console.log(this.activeName);
        },
        // 获取参数的列表数据
        async getParamsData(){
            // 证明选中的不是三级分类
            if(this.selectedCateKeys.length !== 3){
                this.selectedCateKeys = []
                this.manyTableData = []
                this.onlyTableData = []
                return
            }
            // 证明选中的是三级分类

            console.log(this.selectedCateKeys);
            // 根据所选的分类的id，和当前所处的面板，获取对应的参数
            const {data:res} = await this.$http.get(`categories/${this.cateId}/attributes`,{
                params: {sel:this.activeName}
            })

            if(res.meta.status !== 200){
                return this.$message.error('获取参数列表失败！')
            }
            res.data.forEach(item => {
                item.attr_vals = item.attr_vals ? item.attr_vals.split('') :[]
                // 控制文本框的显示与隐藏
                item.inputVisible = false
                // 文本框中输入的内容
                item.inputValue = ''
            });
            console.log(res.res);
            if(this.activeName === 'many'){
                this.manyTableData = res.data
            }else{
                this.onlyTableData = res.data
            }
       },
    //    监听添加对话框的关闭事件
       addDialogClosed(){
           this.$refs.addFormRef.resetField()
       },
    //    点击按钮，添加参数
       addParams(){
           this.$refs.addFormRef.validate(async valid => {
             if(!valid)return
             const {data:res} = await this.$http.post(`categories/${this.cateId}/attributes`,{
                 attr_name:'this.addForm.attr_name',
                 attr_sel: 'this.activeName'
             })  
             if(res.meta.status !==201){
                 return this.$message.error('添加参数失败！')
             }
             this.$message.success('添加参数成功！')
             this.addDialogVisibe = false
             this.getParamsData()
           })
           
       },
    //    点击按钮，展示修改的对话框
        async showEditDialog(attr_id){
               const {data:res} = await this.$http.get(`categories/${this.cateId}/attributes/${attr_id}`,{
                params:{attr_sel: this.activeName}
            }) 
            if(res.meta.status !==200){
                 return this.$message.error('获取参数信息失败！')
             }
            //  this.$message.success('获取参数信息成功！')
                this.editForm = res.data
                this.editDialogVisable =true
       },
    //    点击按钮修改函数
        editParams(){
            this.$refs.addFormRef.validate(async valid => {
                if(!valid)return
                const {data:res} = await this.$http.put(`categories/${this.cateId}/attributes/${this.editForm.attr_id}`,{
                    attr_name:this.editForm.attr_name,
                    attr_sel:this.activeName
                })
                 if(res.meta.status !==200){
                    return this.$message.error('修改参数失败！')
                }
                this.$message.success('修改参数成功！')
                this.getParamsData()
                this.addDialogVisibe = false
                })  
               
        },
        //    监听修改对话框的关闭事件
        editDialogClosed(){
            this.$refs.addFormRef.resetField()
        },
        // 根据id删除对应的参数项
        async removeParams(attr_id){
            const confirmResult = await this.$confirm('此操作将永久删除该参数, 是否继续?', '提示', {
            confirmButtonText: '确定',
            cancelButtonText: '取消',
            type: 'warning'
            }).catch(err => err)

            // 用户取消了删除的操作
            if(confirmResult !== 'confirm'){
                return this.$message.info('已取消删除！')
            }

            // 删除的业务逻辑
            const {data:res} = await this.$http.delete(`categories/${this.cateId}/attributes/${attr_id}`)

            if(res.meta.status !==200){
                return this.$message.error('删除参数失败！')
                }
            this.$message.success('删除参数成功！')
                this.editForm = res.data
                this.editDialogVisable =true
        },
    // 文本框失去焦点或按下了Enter都会触发
        handleInputConfirm(row){
            if(row.inputVisible.itrim().length === 0){
                row.inputValue ='',
                 row.inputVisible = false
                 return
            }
        //    如果没有return，则证明输入的内容，需要做后续处理
            row.attr_vals.push(row.inputValue.trim())
            row.inputValue = ''
            row.inputVisible = false
            // 需要发起请求，保存这次操作
            this.saveAttrVals(row)

        },
        // 将对attr_vals 操作，保存到数据库
        async saveAttrVals(row){
             // 需要发起请求，保存这次操作
            const{data:res} = await this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`,{
                attr_name: row.attr_name,
                attr_sel: row.attr_sel,
                attr_vals:row.attr_vals.join("")
            })
            if(res.meta.status !==200){
                return this.$message.error('修改参数项失败！')
            }
            this.$message.success('修改参数项成功！')
        },
        // 点击按钮，展示文本输入框
        showInput(row){
            row.inputVisible =true
            // 让文本框自动获得焦点
            // $nextTick方法的作用，
            // 就是当页面上元素被重新渲染之后，
            // 才会指定回调函数中代码
            this.$nextTick(_ => {
                this.$refs.saveTagInput.$refs.input.
                focus();
                });
        },
        // 删除对应的参数可选项
        handleClose(i,row){
            row.attr_vals.splice(i,1)
            this.saveAttrVals(row)
        }
    },
    // 计算属性
    computed:{
        isButnDisabled(){
            if(this.selectedCateKeys.length !== 3){
                return true
            }
            return false
        },
        cateId(){
            if(this.selectedCateKeys.length === 3){
                return this.selectedCateKeys[2]
            }
            return null
        },
        // 动态计算标题的文本
        titleText(){
            if(this.activeName === 'many' ){
                return '动态参数'
            }
            return '静态属性'
        }
    }
} 
</script>

<style lang="less" scoped>
.cat_opt{
    margin: 15px 0;
}
.el-tag{
    margin: 10px;
}
.input-new-tag{
    width: 120px;
}
</style>
